He is known for being the first-ever person in the world to climb an 8C+ (V16) boulder, Gioia [fr], in 2008.

In 1999 Core stopped competing in the Lead Climbing World Cup and started participating in the Bouldering World Cup, organized by UIAA in that year for the first time in history.

[3] He has ascended several very hard boulders in Italy near Bobbio Pellice, Varazze, and Triora.

In 2011, Adam Ondra repeated the ascent and confirmed the grade,[4] however, in 2015, Core announced that a hold broke on Gioia, which he could only partially repair, and which slightly lowered the grade.

Core redpointed 8C+ (V16) and flashed 8A (V11) boulder problems.